This sounds like you have a service called "nahimic" running. If you open up Task Manager and look in the services tab, can you look for this service and disable it if it's on? Then restart Big Box and everything should appear normal. If you cannot find it I'd look to see if you have any Realtek program running, they typically use that service (or one like it) and closing it could also potentially correct the issue. Basically they are injecting themselves into the GPU buffer and touching stuff they shouldn't be and it breaks WPF applications.